Cadillac CT6 2016-2020 10L90 Transmission Torque Specifications
This page provides detailed torque specifications for all bolts associated with the 10L90 transmission used in the 2016-2020 Cadillac CT6. Includes case, pan, valve body, and other related hardware.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
Search Specifications
Search by component name, bolt size, or description
Torque Calculator
Convert between different torque units
Transmission Mounting
These specifications pertain to the bolts that secure the transmission assembly to the vehicle, including the engine block and transmission crossmember.
1 Transmission Mounting Bolts (to crossmember/mount)
M12 x 1.75
Transmission Mounting Bolts (to crossmember/mount)
M12 x 1.75Torque Value
Important Notes
2 Transmission Bellhousing Bolts (to engine block)
M12 x 1.75
Transmission Bellhousing Bolts (to engine block)
M12 x 1.75Torque Value
Important Notes
Transmission External Components
These specifications relate to external components of the transmission, including the oil pan, plugs, cooler lines, and wiring harness.
1 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
2 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
3 Transmission Cooler Line Fittings
M16 x 1.5
Transmission Cooler Line Fittings
M16 x 1.5Torque Value
Important Notes
4 Transmission Wiring Harness Bracket Bolts
M6 x 1.0
Transmission Wiring Harness Bracket Bolts
M6 x 1.0Torque Value
Important Notes
Transmission Internal Components
These specifications relate to components located inside the transmission, such as the valve body and TCM.
1 Transmission Internal Valve Body Bolts
M6 x 1.0
Transmission Internal Valve Body Bolts
M6 x 1.0Torque Value
Important Notes
2 Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0
Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0Torque Value
Important Notes
Driveline Components
These specifications relate to the components connecting the transmission to the driveline, specifically the output shaft flange.
1 Transmission Output Shaft Flange Bolts (To Driveshaft)
M12 x 1.25
Transmission Output Shaft Flange Bolts (To Driveshaft)
M12 x 1.25Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Why are torque specifications so important when working on the 10L90 transmission?
Why are torque specifications so important when working on the 10L90 transmission?
Precise torque is critical for proper clamping force and preventing leaks. Over-tightening can damage threads, deform components, and cause component failure. Under-tightening can result in leaks, loosening of bolts due to vibration, and eventual component damage. For instance, over-torquing a transmission pan bolt can distort the pan and create leaks, while under-torquing can cause the pan to loosen and create a leak as well.
Q2 What type of torque wrench should I use?
What type of torque wrench should I use?
It's highly recommended to use a calibrated, high-quality torque wrench, preferably a click-type or digital torque wrench. Using an inaccurate torque wrench can lead to improper torque application, potentially causing issues later on. A beam-type wrench is acceptable but less precise than a click-type or digital wrench.
Q3 Should I replace the bolts when working on the 10L90 transmission?
Should I replace the bolts when working on the 10L90 transmission?
In many cases, yes. It's generally recommended to use new torque-to-yield bolts or bolts with thread locker applied during reassembly. Reusing old bolts, especially bolts that have been torqued to yield, can compromise the clamping force and integrity of the assembly. For example, reusing a worn-out trans-pan bolt might not be able to hold the correct torque value, leading to leakage problems.
Q4 Are there any special tools needed beyond a torque wrench?
Are there any special tools needed beyond a torque wrench?
Yes, depending on the specific job, you may need tools like a transmission jack, various extensions, socket swivel adapters, and possibly a scan tool capable of reading transmission temperature. Specific bolts may require specialized sockets. Having these tools available will make the job safer and easier. For example, an accurate fluid-level check is often best achieved with the transmission at a specific temperature that can only be accurately checked with a scan tool or thermometer.
Q5 What if I don't have the exact torque specifications?
What if I don't have the exact torque specifications?
Never guess or estimate torque values. Always refer to the manufacturer's service manual for your specific year and model of Cadillac CT6 with the 10L90 transmission. If the documentation isn't available, consult a professional mechanic. Incorrect torque values can lead to significant component failure. Using generic torque specs could easily cause damage due to incorrect clamping pressures.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
Torque Wrench (1/2" Drive)
A calibrated torque wrench capable of measuring torque in the specified ranges.
- 1/2" Drive
- Capable of measuring Nm and lb-ft
- Calibrated for accuracy
Torque Wrench (3/8" Drive)
A calibrated torque wrench capable of measuring torque in the lower specified ranges.
- 3/8" Drive
- Capable of measuring Nm and lb-ft
- Calibrated for accuracy
Socket Set (Metric)
A set of metric sockets including sizes commonly used on the 10L90 transmission.
- Sizes ranging from 8mm - 21mm
- 6-point sockets preferred
- Deep and standard sockets
Extension Bars (Various Lengths)
Extension bars of varying lengths to reach recessed bolts on the transmission.
- 1/2" and 3/8" drive extensions
- Varying lengths (3", 6", 10")
- Durable construction
Service Procedures
10L90 Transmission Oil Pan Bolt Torque Procedure
Procedure for properly torquing the transmission oil pan bolts on a 10L90 transmission.
- Clean the oil pan mating surface and transmission case.
- Position the new oil pan gasket onto the transmission.
- Install the oil pan and hand tighten all bolts in a criss-cross pattern.
- Torque the oil pan bolts to 12 Nm (106 lb-in) using a 3/8" drive torque wrench in a criss-cross pattern.
- Verify all bolts are properly torqued.
10L90 Transmission Bellhousing Bolt Torque Procedure
Procedure for torquing the bellhousing bolts on a 10L90 Transmission.
- Clean mating surfaces of bellhousing and engine block.
- Install bellhousing onto the engine and hand tighten bolts evenly.
- Torque the bellhousing bolts to 50 Nm (37 lb-ft) using a 1/2" drive torque wrench in a criss-cross pattern.
- Verify all bolts are properly torqued.
10L90 Transmission Valve Body Bolt Torque Procedure
Procedure for torquing the valve body bolts on a 10L90 Transmission.
- Install the valve body onto the transmission case.
- Hand tighten all valve body bolts evenly.
- Torque the valve body bolts to 10 Nm (89 lb-in) using a 3/8" drive torque wrench in a criss-cross pattern.
- Verify all bolts are properly torqued.
10L90 Transmission Mechatronic Unit Bolt Torque Procedure
Procedure for torquing the mechatronic unit bolts on a 10L90 Transmission.
- Install the mechatronic unit into the transmission case.
- Hand tighten all mounting bolts evenly.
- Torque the mechatronic unit bolts to 10 Nm (89 lb-in) using a 3/8" drive torque wrench in a criss-cross pattern.
- Verify all bolts are properly torqued.
Technical Service Bulletins
PIP5479C - 10L90 Transmission Fluid Leak From Oil Pan
2019-03-15A small number of 2017-2019 GM vehicles equipped with the 10L90 transmission have been reported with transmission fluid leaks at the oil pan. This may be due to incorrect torque or reuse of the gasket.
Resolution: Inspect oil pan for distortion and use new oil pan gasket, and torque the oil pan bolts to 12 Nm (106 lb-in) in a criss-cross pattern.
PIP5619B - 10L90 Transmission Internal Pressure Concerns
2020-07-22Some 2018-2020 vehicles with the 10L90 transmission may exhibit internal pressure related concerns. Improper torque during assembly can contribute to this issue.
Resolution: Ensure all transmission internal bolts, including the valve body, mechatronic unit and internal filter are torqued to the proper specifications as listed in the service procedure.
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
Diagnostic
Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.
Repair
Expert in both traditional mechanical repairs and modern vehicle systems.
Additional Expertise
Documentation
Created over 500 detailed repair guides and technical documents.
Training
Conducted technical training sessions and contributed to repair databases.
Certifications & Research
Certifications
- ASE Master Technician Certification
- Advanced Diagnostic Specialist
- Hybrid/Electric Vehicle Systems
- Performance Tuning Expert
Research & Community
Actively researches emerging technologies and contributes to automotive forums.
Legal Disclaimer
Important information about using this content
Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.
General Information
Warranty & Liability
The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.